On Nov. 28, the U.S. Food and Drug Administration (FDA) announced the approval of Firdapse (amifampridine phosphate) for the treatment of adults with Lambert-Eaton myasthenic syndrome (LEMS). Firdapse, developed by Catalyst Pharmaceuticals, is an oral potassium channel inhibitor designed to prolong signals released from nerves and allow greater stimulation of muscles. This is the eighth . . .